Oval Boost148 Traction chainring for SRAM

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The Original one and only absoluteBLACK premium Sram compatible Direct mount BOOST148 1X Oval chainrings are designed for GXP and Long BB30 spindle cranks. Chainring is dedicated for Boost148 bikes ONLY. Converts a regular Sram crank into a Boost specific setup. (3mm offset). They are also 100-percent optimized for Eagle.

This oval chainring with special 3mm offset converts any Sram crank into Boost148 specific setup needed in Boost equipped bikes. Boost and non-Boost Sram cranks are identical. All the offset is achieved by the chainring itself, so you can use any Sram crank for this conversion. Our regular OVAL chainrings for gxp cranks have 6mm offset whether this one has 3mm, but both chainrings look very similar.

Advantages of our special Direct mount Boost chainrings:

*Finest design to provide excellent weight to strength ratio*One of a kind special oval shape (Patent Pending) *Greatly improves traction and climbing abilities *Unique Patent Pending alternate wide and narrow teeth profile to keep your chain in place for minimum 12 months! *Special 3D teeth machining for ultimate mud relief decrease wear and noise dramatically*They save weight because they don't need the spider and chainring bolts.*The ability of installation of a smaller ring sizes that can't be mounted on regular spider.*Superb quality and great look.*You will ride faster using ovals. If you keep using round ring then others will get quicker.*You will not "feel" the oval shape at all *Reduces stress on knees *We mastered our oval chainrings to perfection, so you can get best possible advantage from the oval/elliptical shape.

Why our oval chainrings work

Our Oval chainrings work because a rider does not produce power evenly through a pedal stroke; they maximize the part of the stroke where power is produced and minimize resistance where it isn't. Oval rings make the spin cycle a lot smoother and are easier on legs while climbing. Believe it (or not), but a round chainring doesn't transfer torque to your rear wheel as smoothly as an Oval one. You will actually feel your stroke to be more "round" with an Oval shape than with a round chainring.

Why it matters

Traction, Traction and Traction. With oval rings rear tire traction improves greatly on loose and slippery terrain. Smoother power delivery to your rear wheel means that you will be able to maintain better, constant cadence; get less stress on the joints (knees) and therefore be able to keep certain level of effort for longer. This results in higher average speed. Moreover, 11 studies made by various Universities in the World show that using oval chainrings human legs utilize more muscle groups (compared to round one), but each of them to lesser degree. Load from pedaling an oval chainring is spread over greater muscle mass which in effect gives you the feeling of fresher and more relaxed legs. It is world's finest oval chainring backed by tens of thousands of customers.

What size should I choose?

* 28T Oval chainring has an ovality of 26/30T and is best for someone who uses currently 27 or 28T round ring.

* 30T Oval chainring has an ovality of 28/32T and is best for someone who uses currently 29 or 30T round ring.

* 32T oval ring will suit best someone who uses 31 or 32T chainring currently. While pedaling, you will feel similar effort to the one riding round 31T ring, but you will gain the speed similar to riding 34T chainring.

* 34T Oval chainring has an ovality of 32/36T and is best for someone who uses currently 33 or 34T round ring.

* 36T Oval chainring has an ovality of 34/38T and is best for someone who uses currently 35 or 36T round ring.

How to mount Oval BOOST 148 chainring to Sram GXP and BB30 crank:

You need to unscrew these 3 torx t-25 bolts from the crank. Then remove the spider+chainring combo you currently have there. Clean the splines and put some grease on them. Position the chainring in place (note there is only one way to fit this Sram chainring so you don't have to worry how to do it). Close all 3 bolts to about 5-7Nm.

Oval (elliptical) chainring does not compromise the work of clutch mechanism in rear derailleur(video at the bottom). These chainrings also help you to recover after knee injuries as pedaling becomes smoother and less exhausting. It is the most advanced oval chainring currently on the market.

The most advanced, Patent Pending alternate wide and narrow teeth profile currently produced, guarantee minimum 12 months of excellent chain retention capabilities! We mean it. Always use a new chain with a new chainring.

If you wish to check for frame clearance with new oval ring, below you can find measurement of biggest dimension of the oval (tip to tip of tooth):

26T: 118mm ; 28T: 127mm ; 30T: 134mm ; 32T: 143mm ; 34T: 151mm

Word on BIOPACE - Please understand that this is not Biopace technology. Shimano created Biopace with the completely wrong orientation of the biggest radius of the oval. Instead of positioning it in power zone which is slightly below the level of the crank, they clocked it to the dead zone where human generates least power. The result was that in power zone pedaling was too easy and in dead zone very difficult. Exactly opposite to how it should be.

The importance of timing and shape with oval chainrings

The oval chainring movement across all cycling disciplines is growing rapidly, led by absoluteBLACK, the world leaders in this important product category.

However, not all oval chainrings share the same performance characteristics as absoluteBLACK. The 'clocking' (timing) and shape of the oval are the most crucial parts of any oval chainring design, absoluteBLACK spent three years in design development and have perfected both timing and shape design elements - ensuring the ride quality of absoluteBLACK oval ring will be different and superior to ovals from other brands (as many abosluteBLACK customers already realised).

Where most other brands retain the same timing (position of the crank arm relative to the oval) and shape of the oval across all their sizes - because it's cheaper and less time consuming. absoluteBLACK believe that each different size ring requires a bespoke, optimised, perfect pedalling solution. So that is what we do - for every chainring absoluteBLACK make. For example, the smaller the chainring size, the bigger the ovality has to be to help climb steeper hills more effectively. We keep our exact Patent Pending data a secret, to ensure we get the best possible absoluteBLACK advantage over other brands, and you get the best possible ride experience.

Our longterm belief in oval and development of our design, has led absoluteBLACK to become the most commercially successful oval chainring product in the world. So keep in mind that not every oval chainring is equal to an absoluteBLACK.

Designed in UK. Manufactured in Poland (EU).

SRAM, GXP, Eagle and XX1 are trademarks of SRAM LLC and are used for informational purposes only.